Show HN: OpenTaxRate – open-source US sales tax rates by street address

Category: infrastructure

Tags: sales-tax, geospatial, postgis, address-lookup, open-data

Score: 6.8/10 (Innovation: 6, Technical: 7, Documentation: 8, Utility: 6)

OpenTaxRate is a self-hostable TypeScript API that resolves combined US sales tax rates by street address and date, combining address ranges, PostGIS tax boundaries, and dated rates with explicit 422 declines for ambiguous lookups. It stands out for its verifiability — published sources, benchmarks, and a refusal to guess — filling a niche currently served by expensive compliance vendors.

Target audience: backend devs, fintech engineers, e-commerce platform teams, and developers building billing/tax features

Repository: https://github.com/equated-org/opentaxrate · TypeScript · MIT · 1 stars

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